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A triangle.
This is true, by definition. Assume that there is a circle that passes through each vertex of a triangle. Then its centre, which we may call the circumcentre of the triangle, must be at an equal distance from each of the vertices because all of the points of the circle are at the same distance from this point.
They would be intersecting.
A triangle containing an obtuse angle is an obtuse triangle.
i don't get the joke. kidding. an equilateral triangle